Djupvik, AA and Liimets, T and Zinnecker, H and Barzdis, A and Rastorgueva-Foi, EA and Petersen, LR, Proper motions of embedded protostellar jets in Serpens, Astronomy & Astrophysics, 587 Article A75. ISSN 1432-0746 (2016) [Refereed Article]
© ESO, 2016
Aims: We determine the proper motion of protostellar jets around Class 0 and Class I sources in an active star forming region in Serpens.
Methods: Multi-epoch deep images in the 2.122 μm line of molecular hydrogen, v = 1−0 S(1), obtained with the near-infrared instrument NOTCam on a timescale of 10 years, are used to determine the proper motion of knots and jets. K-band spectroscopy of the brighter knots is used to supply radial velocities, estimate extinction, excitation temperature, and H2 column densities towards these knots.
Results: We measure the proper motion of 31 knots on different timescales (2, 4, 6, 8, and 10 years). The typical tangential velocity is around 50 km s-1 for the 10-year baseline, but for shorter timescales, a maximum tangential velocity up to 300 km s-1 is found for a few knots. Based on morphology, velocity information, and the locations of known protostars, we argue for the existence of at least three partly overlapping and deeply embedded flows, one Class 0 flow and two Class I flows. The multi-epoch proper motion results indicate time-variable velocities of the knots, for the first time directly measured for a Class 0 jet. We find in general higher velocities for the Class 0 jet than for the two Class I jets. While the bolometric luminosites of the three driving sources are about equal, the derived mass flow rate Ṁout is two orders of magnitude higher in the Class 0 flow than in the two Class I flows.
|Item Type:||Refereed Article|
|Keywords:||stars: formation; ISM: jets and outflows; Herbig-Haro objects; ISM: kinematics and dynamics|
|Research Division:||Physical Sciences|
|Research Group:||Other physical sciences|
|Research Field:||Other physical sciences not elsewhere classified|
|Objective Division:||Expanding Knowledge|
|Objective Group:||Expanding knowledge|
|Objective Field:||Expanding knowledge in the physical sciences|
|UTAS Author:||Rastorgueva-Foi, EA (Dr Elizaveta Rastorgueva-Foi)|
|Web of Science® Times Cited:||1|
|Deposited By:||Mathematics and Physics|
|Downloads:||180 View Download Statistics|
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